<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<!-- <my-search :bgcolor="'pink'"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh + 'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i===active ? 'active' : ' ']" @click="activeChanged(i)">
						{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
				    <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					 <!-- 动态渲染三级分类的列表数据 -->
					    <view class="cate-lv3-list">
					      <!-- 三级分类 Item 项 -->
					      <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
					        <!-- 图片 -->
					        <image :src="item3.cat_icon"></image>
					        <!-- 文本 -->
					        <text>{{item3.cat_name}}</text>
					      </view>
					    </view>
				  </view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixis/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				wh: 0,
				// 分类数据列表
				cateList: [],
				// 当前选中项的索引，默认让第一项被选中
				active: 0,
				// 二级分类列表
				cateLevel2: [],
				// 滚动条距离顶部距离
				scrollTop:0
				
			};
		},
		onLoad() {
			// 获取当前系统的信息
			const sysInfo = uni.getSystemInfoSync()
			// 为 wh 窗口可用高度动态赋值
			this.wh = sysInfo.windowHeight-50
			// 调用获取分类列表数据的方法
			this.getCateList()
		},
		methods: {
			async getCateList() {
				// 发起请求
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 判断是否获取失败
				if (res.meta.status !== 200) return uni.$showMsg()
				// 转存数据
				this.cateList = res.message
				// 为二级分类赋值
				  this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i
				// 为二级分类列表重新赋值
				  this.cateLevel2 = this.cateList[i].children
				  // 让 scrollTop 的值在 0 与 1 之间切换
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodList(item3){
				uni.navigateTo({
					url:'/subpkg/good_list/good_list?cid=' + item3.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				&.active {
					background-color: #ffffff;
					position: relative;

					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						top: 25%;
					}
				}
			}
		}
		.cate-lv2-title {
		  font-size: 12px;
		  font-weight: bold;
		  text-align: center;
		  padding: 15px 0;
		  
		}
		.cate-lv3-list {
		  display: flex;
		  flex-wrap: wrap;
		
		  .cate-lv3-item {
		    width: 33.33%;
		    margin-bottom: 10px;
		    display: flex;
		    flex-direction: column;
		    align-items: center;
		
		    image {
		      width: 60px;
		      height: 60px;
		    }
		
		    text {
		      font-size: 12px;
		    }
		  }
		}
	}
	
</style>